Kim Kardashian and Kendall Jenner have a boob off in low-cut tops as they hang with Justin Bieber - Mirror Online

#xa; The reality star and her younger sister competed in a battle of the boobs in revealing black tops as they mingled with Bieber

Kim Kardashian and Kendall Jenner have a boob off in low-cut tops as they hang with Justin Bieber - Mirror Online

Kim Kardashian and Kendall Jenner have a boob off in low-cut tops as they hang with Justin Bieber - Mirror Online

Kim Kardashian and Kendall Jenner have a boob off in low-cut tops as they hang with Justin Bieber - Mirror Online